Danfoss 436-6859 4366859 swing motor for Wacker Neuson EZ 17 EZ17 John Deere E18ZS Caterpillar 301.7D CR mini excavator
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Component: Main Hydraulic Swing Drive Motor Assembly (Dynamic Rotation Unit)
Manufacturer Architecture: Danfoss / Comprep Integrated Swing Motor Series
OEM Cross-Reference Part Numbers:
Caterpillar: 436-6859, 4366859
Wacker Neuson / John Deere: OEM Cross-Reference Equivalent
Machine Compatibility:
Caterpillar (CAT): 301.7D CR Mini Excavator
Wacker Neuson: EZ 17 / EZ17 Compact Excavator
John Deere: E18ZS Mini Excavator
Condition: Genuine Original New / Premium OEM Specification Equivalent (Complete Drop-In Unit)
2. Technical Specifications
Motor Type: Fixed/Variable Displacement Axial Piston Swing Motor with Integrated Reduction Unit
Operating Performance: High-torque rotation profile engineered specifically for 1.5 to 2.0-ton mini excavator upper-structure swing controls.
Integrated Control Network: Equipped with integrated crossover relief valves, anti-cavitation logic, and an automatic mechanical dynamic parking brake.
Interface Design: Precision-machined mounting flange and output shaft designed for direct engagement with the machine's slew ring bearing.
3. Critical Installation Requirements
Swing Motor Housing Priming (Mandatory)
Before starting the engine or engaging the swing control, pre-fill the swing motor casing with clean, fresh hydraulic fluid through its highest case drain port. Running an axial piston motor dry—even for a few seconds—will score the swash plate and piston slippers, causing immediate total loss of pressure.
Verify Case Drain Line Backpressure
Inspect the low-pressure case drain hose returning to the main hydraulic oil reservoir. Ensure there are no sharp bends, kinks, or restrictions. High case drain backpressure will blow out the main shaft seal and contaminate the internal reduction gear section.
Air Bleeding & Initial Startup Procedure
After mounting and pre-filling the housing, loosen the top air bleed port on the motor manifold. Crank the engine with fuel delivery disabled until clear, bubble-free hydraulic oil flows out, then retighten the plug. Allow the machine to idle under no load for 10 to 15 minutes to purge remaining air.
Hydraulic System Decontamination
If replacing a motor that suffered internal mechanical failure, drain and flush the main hydraulic reservoir, clean oil cooler lines, and replace all return and suction filter elements before running the machine under load.
4. Frequently Asked Questions (FAQ)
Q: Is Caterpillar part number 436-6859 directly compatible across these 1.5–2.0 ton mini excavators?
A: Yes. Part number 436-6859 cross-references directly to the Danfoss swing motor platform utilized across CAT 301.7D CR, Wacker Neuson EZ17, and John Deere E18ZS models. Physical mounting dimensions, port thread patterns, and output gear profiles match factory specifications.
Q: My CAT 301.7D CR over-swings or drifts when parked on a slope. Is the swing motor at fault?
A: Upper-structure drift or uncontrolled rotation usually indicates worn internal friction brake discs, leaking crossover shock relief valves, or scored cylinder surfaces inside the motor block. Replacing the motor assembly restores exact position holding and swing stopping control.
Q: Does this unit arrive complete with the control valve manifold installed?
A: Yes. The unit comes fully assembled as a single complete drop-in unit, pre-fitted with the axial piston motor section, integrated planetary reduction gear stage, and pre-calibrated brake/relief valve manifold block.
5. Shipping & Logistics
Packaging: Preserved with anti-corrosion storage oil, fitted with plastic port caps, and bolted securely inside an export-safe wooden crate.
Transit Time: Global express air freight via DHL/FedEx/UPS typically delivers within 3 to 7 business days directly to your workshop or job site.